Salaried and production workers across the United States favored the deal, but skilled trades workers such as electricians and pipe fitters voted it down. Under the union’s constitution, the executive board made the final decision to ratify the pact.

The approval means all three Detroit automakers have signed deals with the union, and labor peace is likely at least through September 2015.

Under the deals, most workers at Chrysler, Ford and General Motors won’t get pay raises. But they’ll get signing bonuses, profit-sharing and other payments. The deals also promise at least 13,000 new jobs at all three companies and give raises to entry-level workers who make about half the pay of longtime UAW members.

About 56 percent of skilled trades workers voted against the contract, forcing the executive board to review the deal. The board, meeting by teleconference yesterday declared the contract ratified after determining skilled trades workers voted against it mainly for economic reasons that weren’t unique to their jobs.

Under the constitution, skilled trades issues can be separated from the rest of the union but only if the issues are specific to their work.

The union and Chrysler reached a tentative agreement on the new contract Oct. 12, and Chrysler Group LLC’s 26,000 union workers finished voting on the deal Tuesday night.

The Chrysler deal includes a $3,500 signing bonus, and its profit-sharing checks are far lower than workers will get at Ford Motor Co. and General Motors Co. Ford’s signing bonus is $6,000, and GM’s is $5,000. Chrysler Group LLC has yet to make a full-year profit since it emerged from bankruptcy protection in 2009; GM and Ford have each made billions. Chrysler needed $12.5 billion in government loans to survive bankruptcy.

The Chrysler deal promises up to 2,100 new jobs and investment of $4.5 billion in U.S. factories.